如何从Excel中的验证列表中获取单元格行

I'm working on a Ruby on Rails project. I have Language and Category tables, the category table is the child of language. I have a xlsx file to create new categories instead of using a form in html. The steps are 1) downloading a template containing a worksheet with the language list, 2) in a second worksheet, the user can add new categories, 3) upload the xlsx template with the added fields.I'm working on a Ruby on Rails project. I have